The F-line was a line of genetic slaves bred by Manpower Incorporated of Mesa.

F-lines were bred to do heavy manual labor, so they were designed to be physically strong and muscular.

Donald X, or F-67d-8455-2/5, was an escaped F-line who joined the Audubon Ballroom. (CS1)

Hugh Arai, or F-23xb-74421-4/5, was an F-line who joined the Beowulfan Biological Survey Corps after his rescue. (CS2)

Mesan Genetic Lines
Alpha lines Bardasano | Detweiler | Ford | Hitchcock | Hurskainen | Kakadelis | Kubrick | Lucas | Monticelli | O'Hanrahan | Polanski | Stone | Tarantino | Thompson
Beta lines Lathorous
Gamma lines
Slave lines C-line | D-line | E-line | F-line | J-line | K-line | V-line